Filter



F. l.. MYERS Nov. 22, 1938.

FILTER Filed Nov. 27, 1955 if we NTOR BW ATTORNEQ 5 envelopes containingthe filtering material and cell is a rear grill I5 and a front grill I6by which l5 33 inafter. walls within which it is mounted. 30

in position or removed from the frame, anges which provide an -abutmentfor the grills.

:40 Fig. 4 is a sectional View showing a modified The IOWQI" flOIltflange S OImed by a Strip 2l 40 form of removable front grill. securedto the frame member i2 and having an Fig. is aperspective view of aself-supporting upturrled POIOD- in .the fOIm 0f a flange 22. All sheetor unit of iiltering material. angle bar or strip 23 also securedl tothe frame N5@ lNar-22;lese y i' l.12.54137346- UNITED `sri srEs I.PATENT oi-HCE Frank L. Myers, Newark', Ohio, assignor to Owens- IllinoisGlass Companyya corporation of Ohio Application November 27, 1935,serial No. 51,755*A "4 oiaims. (ci. v1in- 49) My invention relates tolters designed for fil. `as a whole to make it self-supporting so thattering air and other gases. More particularly it retainsits shape whilebeing handled. Such marelates to lter units of the throw-away typeterial 'may consist, for example, of vulcanized intended tobe used untilthey accumulate dust or rubber. The binder may consist of latex applied5 dirt to their full normal capacit'yand then to be in the form of aspray or otherwise and then 5 discarded and replaced by new filterunits. vulcanized. The -lter bers are also coated with Filter units ofthe type designed for single use a dust-catching material such asl aviscous oil or ordinarily consist of a body of brous ltering oilysubstance. l material in matted form and a container or car- Theframework i i in which the filter units ar l0 ton in which said body iscontained and by which mounted, comprises horizontal frame members 10the filtering material is held in shape while in use. i2 and I3 andvertical frame members I4 spaced The major surfaces of such containersare made to provide rectangular cells of a size correspondof openwork orgrills to permit the free passage ing to the filter units l0 and inwhich the latter of air or 'gases through the filter. The cartons or areremovably supported. Associated with each forming part of the lterunits, are thrown away the filters are supported and held in positionwithwith the nltering material and add materially to in the cells. Thefront grill i6 comprises a body the expense of the filter units. ofopenwork material which may consist of ex- An object of the presentinvention is to provide panded metal or may be of other openwork conaiilter apparatus comprising self-supporting lstruction permitting thefree passage of air and ter units in which'the fibrous lter body retainshaving the requisite strength and rigidity. A its shape without the useof an envelope or other border il which may be of sheet metal, extendscontainer, in combination with fa supportingl along the margins of thegrill and may be solframework in which the units' are removably inderedor otherwise secured thereto. A strip Iii stalled. The invention thusprovides a filter apof felt or other material is folded over the borderparatus in which the used lter material can be ll and may be Securedthereto by an adhesive. replaced with great facility and at an extremelyThis felt strip extends along the entire margin low cost. i of the grilland serves as a sealing gasket to pre- Other objects of the inventionwill appear herevent air leakageh between the filter and th'e cellReferring to the accompanying drawing: Y The rear grill `l5 may be ofsubstantially the Fig. 1 is a perspective view illustrating a group sameconstruction as the front grill it. It also of filter pads or units andthe framework in includes a marginal strip or frame covered with Whichthey are mounted. Y felt or the like to provide a sealing gasket. TabsFig. 2 is a cross-sectional view-of the same at i5 which may be integralwith the bOrder Il, are 35 the line II`II on Fig. l. provided forattaching the'grill i5 to the frame Fig. 3 is a fragmentary sectionaldetail show- Work Il and holding it permanently ll DOSOH- ing how thefront supporting grill may be' placed The cell walls are provided withfront and rear Fig. 6 is a 4fragmentary perspective view showmember l2has an upiurnd flange 24 providing ing a, grill and means for attachingit t0 the an abutment fOI the grill l5. The upper fl'aJl'le 45framework. member I3 has its front and rear margins turned The apparatuscomprisesfilter units I0 removdownward to form flanges 25 and 26providing ably mounted in a supporting framework Il. abutments for theupper edges of the front and 'The framework may be permanently installed`in rear grills. Front and rear sheet metal strips 2l .i0 an opening in.a wall of a building or lelsewhere. and 28 which overlie and are securedto the 50 The filter unit consists of a body of fibrous maflanges 25 and26, respectively, project upwardly terial, as, for example, fibrousglass, in matted above the upper face of the frame member I3 to orfelted form. `A suitable binding material may provide abutments for thegrills in the tier of be used to bond the fibers together and give thecells above the frame member i3. The vertical U5 requisite strength andrigidity to the lter body frameV members i4 may also be formed with 55CFI anges 29 to provide abutments for the vertical edges of the reargrills I5.

As herein shown, a plurality of filter units I0 are mounted in each cellof the framework II. After the framework has been assembled and thegrills I5 secured in position, the filter units I 0 are introducedthrough the open front of the cells. The front grills I6 are then placedin position to complete the assembly. The front grill is placed inposition by first inserting the upper edge behind the upper front flange25 and then raising the grill as indicated in Fig. 3 so that the loweredge thereof clears the lower flange 22, permitting the lower end of thegrill to be moved back past the plane of the lower flange, the grillthen being moved bodily downward to rest on the frame member I2. Itwill' be noted that the upper fiange 25 is substantially wider than thelower flange so that it engages and supports the grill while the latteris in its lowered position. It will thus be seen that the grill can bevery easily and quickly placed in position where it is securely heldwithout any auxiliary locking or holding devices. It can also be removedwith equal facility by simply lifting it to clear the lower flange 22and then swinging the lower end outward as indicated by dotted lin es inFig. 2.

When the filter is in use, the force of the air passing therethrough hasa tendency to distort or disrupt the filter pads. Any bending ordistortion of the filter pad is detrimental and impairs its emciency.The grills I5 and I6 by providing a firm backing or support for theentire major surface areas of the filter, effectually prevent suchdistortion and obviate the necessity of the usual supporting devicesprovided as a part of the filter units.

When the filter has vbeen in use until it has accumulated dust orforeign material to its normal capacity, the filter units can be quicklyremoved and replaced by new units. As a large percentage of the dust isarrestedin the filter pad at the front or intake side of the filter, itis usually not necessary to replace all the filter units. It is oftenpractical to discard the front pad or pads and then place the new padsat the rear or outlet side. The other 1used pads which are comparativelyclean then take the place of the pad or pads which are discarded.

Figure 4 shows a form of grill I6 in which the sealing material I8 isomitted. ,When the rear grill I5 is provided with a sealing gasket itwill ordinarily serve effectively to prevent air leakage so that thegasket on the front grill is unnecessary. On the other hand, the frontgrill alone may be provided with sealing material, if preferred.

Modifications may be resorted to within the spirit and scope of myinvention.

I claim:

1. A filtering apparatus comprising a stationary framework formed toprovide a rectangular cell, flanges extending along the cell walls andproviding an abutment, a grill mounted in the cell with its marginalsurfaces bearing against said abutment, said grill forming the rear wallof the cell, a rigid self-supporting body of filtering material mountedin said cell and bearingagainst said grill, said body composed of amatted mass of fibers bonded together to form a rigid handleable pad, afront grill, and means for removably holding the front grill in saidcell with the grill bearing against the front face of the filter body,said last mentioned means comprising holding strips extending alongopposite walls of the cell, one of said strips extending from the cellwall a greater distance than the other, the front grill being of suchdimensions that it can be engaged behind said holding strips and can bereleased from the holding strips by amovement in its own plane, forremoval from the cell.

2. A filtering apparatus comprising a stationary framework formed toprovide a rectangular cell, flanges extending along the cell walls andproviding an abutment, a grill mounted in the cell with its marginalsurfaces bearing against said abutment, said grill forming the rear wallof the cell, a rigid, self-supporting body of filtering material mountedin said cell and bearing against said grill, said body composed of amatted mass of fibers bonded together to form a rigid handleable pad, afront grill, and means for removably holding the front grill in saidcell with the grill bearing against the front face of the filter body,said last mentioned means comprising a holding strip extending along'theupper cell wall and projecting downward therefrom, and a holding stripextending along the lower cell wall and projectingupwardly therefrom,said front grill being of such dimensions that it can be lifted to clearsaid lower strip and thereby permit the removal of the grill from thecell.

3. A filtering apparatus comprising a stationary supporting frameworkfor a self-supporting filter pad of fibrous material consisting ofreticulated fibrous glass and a binder therefor, and a coating ofadhesive over the fibers, said framework formed of quadrilaterallyarranged plates providing a cell, a grill secured in said cell inposition to form a backing for a filter pad mounted in the cell at thedischarge side thereof, and means for removably securing saidself-supporting filter pad -within the cell, said means comprising asecond grill, and a flange secured to said framework and projectinginwardly into said cell for removably holding the second grill inposition to bear against and form a facing for a filter pad mounted inthe cell.

4. A filtering apparatus comprising a stationary supporting frameworkfor a self-supporting filter pad of fibrous material consisting ofreticulated fibrous glass, a binder therefor, and a coating over thefibers of material adapted to collect dust particles, said frameworkformed ofv quadrilaterally arranged plates providing a cell, a grillsecured in said cell in position to form a backing for a filter padmounted in the cell at the discharge side thereof, a second grillremovably securing said self-supporting filter pad within the cell, anda flange secured to said framework and projecting inwardly into saidcell and removably holding the second grill in position to bear againstand form a ,facing for a filter pad mounted in the cell.

. FRANK L. MYERS.

